Estimate standby generator kW from essential residential loads. Service conductors still require separate Rule 8-200 and 4-004 sizing.
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By using this calculator you agree to our Terms. This tool does not provide authoritative or binding interpretations of CSA requirements. All values must be verified by a qualified professional and approved by the Authority Having Jurisdiction (AHJ).
Calculations aligned with CE Code 2024 · Standby load & demand methods · CE Code 2024. Verify adopted edition and local amendments with your AHJ.
Select essential loads above; the calculator applies demand factors and recommends generator size.
Choose heating, refrigeration, lighting, pumps, and other circuits that must run during an outage. Exclude non-essential loads to keep generator size practical.
Not all loads run at full nameplate simultaneously. The calculator applies residential demand methods to estimate realistic standby kW.
Add margin for motor inrush on pumps and compressors. Compare results to generator nameplate kW or kVA and transfer switch ratings.
Generator sizing is separate from service conductor sizing. Use the residential load calculator and conductor sizer for the permanent service.
Four CE Code–aligned tools for Canadian residential work — each runs live in your browser with no signup required for calculations.
Rule 8-200 service sizing for houses and row homes.
Ampacity, voltage drop, and raceway derating.
Junction and device box capacity under Rule 12-3034.
Standby generator kW for essential residential loads.
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